hl7-2 0.2.7

HL7® v2 (releases 2.1-2.9) for Rust: parse, navigate, validate, modify, and render Health Level Seven (HL7) version 2 messages, in three modes: generic, schema-based, and struct-based. Published as `hl7-2` (the name `hl7-v2` belongs to an unrelated crate); most users get it through the `hl7` umbrella crate instead, as `hl7::v2`. HL7®, and FHIR® are the registered trademarks of Health Level Seven International and their use of these trademarks does not constitute an endorsement by HL7. This project is an independent work.